opus_pvq: minor cleanups

Removes unneeded variables, renames confusing and innacurate variables
and rewrites and slightly optimizes hadamard interleave/deinterleave
functions.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

libavcodec/opustab.c

@@ -930,11 +930,12 @@ const uint8_t ff_celt_bit_deinterleave[] = {
     0xC0, 0xC3, 0xCC, 0xCF, 0xF0, 0xF3, 0xFC, 0xFF
 };
 
-const uint8_t ff_celt_hadamard_ordery[] = {
+const uint8_t ff_celt_hadamard_order[] = {
     1,   0,
     3,   0,  2,  1,
     7,   0,  4,  3,  6,  1,  5,  2,
-    15,  0,  8,  7, 12,  3, 11,  4, 14,  1,  9,  6, 13,  2, 10,  5
+    15,  0,  8,  7, 12,  3, 11,  4, 14,  1,  9,  6, 13,  2, 10,  5,
+    0,   1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15
 };
 
 const uint16_t ff_celt_qn_exp2[] = {

libavcodec/opustab.h

@@ -146,7 +146,7 @@ extern const uint8_t  ff_celt_log2_frac[];
 extern const uint8_t  ff_celt_bit_interleave[];
 extern const uint8_t  ff_celt_bit_deinterleave[];
 
-extern const uint8_t  ff_celt_hadamard_ordery[];
+extern const uint8_t  ff_celt_hadamard_order[];
 
 extern const uint16_t ff_celt_qn_exp2[];
 extern const uint32_t ff_celt_pvq_u[1272];